Twitter has become a nemesis of the NFL. Incidents involving Minnesota’s Bernard Berrian tweeting that quarterback Tarvaris Jackson was out for the season after spraining a knee ligament (he later said he was joking) and Bengals receiver Chad Ochocinco stating that he wants to tweet during games has the league taking the social networking site seriously.

Based on a long-standing NFL rule, players, coaches and other personnel are not allowed to use cellphones or other electronic devices on the field, or in the locker room from the start of pregame warmups through the end of the game, including halftime, according to Brian McCarthy, an NFL spokesman.

The NFL has yet to create an official Twitter policy outside of those boundaries, however, though it is looking into it.

On Tuesday, the agent for cornerback Antonio Cromartie confirmed that the San Diego Chargers fined his client $2,500 for using Twitter to complain about food at training camp.

The Broncos’ Eddie Royal and Champ Bailey are both active on Twitter. New coach Josh McDaniels said he doesn’t know much about the service .

“I don’t really have a Twitter policy. I don’t know what it means, I don’t know what it is,” McDaniels said recently. “The myface, spacebook, Facebook stuff, I don’t really know what that is, either.”

After Vikings tight end Visanthe Shiancoe tweeted during a training camp team meeting “Zzzzzz zzzzz zzz zzz (in meetings) lol.. Introducing the staff” — McDaniels was asked about his policy. He said Broncos players cannot have their cellphone in a training camp meeting.

“We don’t have any electronics in meetings other than the clicker the coach is holding,” he said.

Major League Baseball has a similar policy regarding cellphones and mobile devices; players are not allowed to use them during a game, or have them on the bench.

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